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119 lines
3.1 KiB
119 lines
3.1 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* linux/arch/i386/kernel/head32.c -- prepare to run common code |
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* |
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* Copyright (C) 2000 Andrea Arcangeli <[email protected]> SuSE |
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* Copyright (C) 2007 Eric Biederman <[email protected]> |
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*/ |
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#include <linux/init.h> |
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#include <linux/start_kernel.h> |
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#include <linux/mm.h> |
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#include <linux/memblock.h> |
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#include <asm/desc.h> |
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#include <asm/setup.h> |
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#include <asm/sections.h> |
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#include <asm/e820/api.h> |
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#include <asm/page.h> |
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#include <asm/apic.h> |
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#include <asm/io_apic.h> |
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#include <asm/bios_ebda.h> |
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#include <asm/tlbflush.h> |
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#include <asm/bootparam_utils.h> |
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static void __init i386_default_early_setup(void) |
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{ |
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/* Initialize 32bit specific setup functions */ |
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x86_init.resources.reserve_resources = i386_reserve_resources; |
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x86_init.mpparse.setup_ioapic_ids = setup_ioapic_ids_from_mpc; |
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} |
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asmlinkage __visible void __init i386_start_kernel(void) |
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{ |
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/* Make sure IDT is set up before any exception happens */ |
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idt_setup_early_handler(); |
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cr4_init_shadow(); |
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sanitize_boot_params(&boot_params); |
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x86_early_init_platform_quirks(); |
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/* Call the subarch specific early setup function */ |
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switch (boot_params.hdr.hardware_subarch) { |
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case X86_SUBARCH_INTEL_MID: |
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x86_intel_mid_early_setup(); |
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break; |
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case X86_SUBARCH_CE4100: |
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x86_ce4100_early_setup(); |
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break; |
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default: |
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i386_default_early_setup(); |
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break; |
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} |
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start_kernel(); |
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} |
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/* |
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* Initialize page tables. This creates a PDE and a set of page |
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* tables, which are located immediately beyond __brk_base. The variable |
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* _brk_end is set up to point to the first "safe" location. |
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* Mappings are created both at virtual address 0 (identity mapping) |
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* and PAGE_OFFSET for up to _end. |
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* |
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* In PAE mode initial_page_table is statically defined to contain |
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* enough entries to cover the VMSPLIT option (that is the top 1, 2 or 3 |
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* entries). The identity mapping is handled by pointing two PGD entries |
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* to the first kernel PMD. Note the upper half of each PMD or PTE are |
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* always zero at this stage. |
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*/ |
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void __init mk_early_pgtbl_32(void) |
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{ |
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#ifdef __pa |
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#undef __pa |
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#endif |
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#define __pa(x) ((unsigned long)(x) - PAGE_OFFSET) |
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pte_t pte, *ptep; |
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int i; |
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unsigned long *ptr; |
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/* Enough space to fit pagetables for the low memory linear map */ |
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const unsigned long limit = __pa(_end) + |
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(PAGE_TABLE_SIZE(LOWMEM_PAGES) << PAGE_SHIFT); |
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#ifdef CONFIG_X86_PAE |
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pmd_t pl2, *pl2p = (pmd_t *)__pa(initial_pg_pmd); |
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#define SET_PL2(pl2, val) { (pl2).pmd = (val); } |
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#else |
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pgd_t pl2, *pl2p = (pgd_t *)__pa(initial_page_table); |
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#define SET_PL2(pl2, val) { (pl2).pgd = (val); } |
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#endif |
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ptep = (pte_t *)__pa(__brk_base); |
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pte.pte = PTE_IDENT_ATTR; |
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while ((pte.pte & PTE_PFN_MASK) < limit) { |
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SET_PL2(pl2, (unsigned long)ptep | PDE_IDENT_ATTR); |
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*pl2p = pl2; |
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#ifndef CONFIG_X86_PAE |
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/* Kernel PDE entry */ |
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*(pl2p + ((PAGE_OFFSET >> PGDIR_SHIFT))) = pl2; |
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#endif |
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for (i = 0; i < PTRS_PER_PTE; i++) { |
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*ptep = pte; |
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pte.pte += PAGE_SIZE; |
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ptep++; |
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} |
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pl2p++; |
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} |
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ptr = (unsigned long *)__pa(&max_pfn_mapped); |
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/* Can't use pte_pfn() since it's a call with CONFIG_PARAVIRT */ |
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*ptr = (pte.pte & PTE_PFN_MASK) >> PAGE_SHIFT; |
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ptr = (unsigned long *)__pa(&_brk_end); |
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*ptr = (unsigned long)ptep + PAGE_OFFSET; |
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} |
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